\begin{first}
	body of the environment body of the environment body of the environment%
\end{first}
some more text

\begin{second}
	body of the environment body of the environment body of the environment%
\end{second}
% comment!

\begin{third}
	body of the environment body of the environment body of the environment%
\end{third}
% comment!

here is some text
\begin{equation}
	x^2%
\end{equation}
text
